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Method for smelting chromium-nickel-iron alloy from stainless steel dust-removing ash

An inconel and stainless steel technology is applied in the field of stainless steel dust smelting inconel, which can solve the problems of low metal yield, polluting the surrounding environment, and difficulty in recycling by dust removal and recycling equipment.

Inactive Publication Date: 2008-02-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing method, the dust in the smelting process is particularly large, and it is difficult for the dust removal and recovery equipment to recover all of it. Not only will it pollute the surrounding environment, but the metal recovery rate is also low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Embodiment one: present embodiment is to make mother liquor after melting with common return scrap steel.

[0085] Step 1: Making Dust Removal Ash Briquettes

[0086] 1) mixed

[0087] Stir and mix stainless steel dust removal dust and carbon steel dust removal mud at room temperature to form a mixture. The weight ratio of the mixture is as follows:

[0088] Stainless steel dust collector 85

[0089] Carbon steel dust mud 15

[0090] The composition (proportion by weight) of the stainless steel dedusting ash is as follows:

[0091] TFe: 41 FeO: 20 CaO: 13.2 SiO 2 : 6.1 MgO: 4.5 Al 2 o 3 : 1.2

[0092] MnO: 3.3 Cr 2 o 3 : 15.05 NiO: 3.02 P 2 o 5 : 0.03S: 0.18

[0093] There are trace elements not greater than 0.00003 (0.003%)

[0094] The composition (proportion by weight) of carbon steel dust removal mud is:

[0095] TFe: 47.38 FeO: 50.15 CaO: 16.10 SiO 2 : 3.01

[0096] MgO: 5.53 Al 2 o 3 : 2.13 MnO: 0.31 P 2 o 5 : 0.19S: 0.070

[0097] Others are ...

Embodiment 2

[0127] The present embodiment is to make mother liquor after melting stainless slag steel.

[0128] The first step: make the dedusting ash briquette, which is the same as the first embodiment.

[0129] Step Two: Make the Mother Liquor

[0130] 1) First spread 0.5 tons of lime on the bottom of the electric furnace, and then spread 1.2 tons of coke;

[0131] 2) Add 9 tons of stainless slag steel to the electric furnace with material blue;

[0132] 3) The power transmission gear is selected to the 5th gear (voltage 190±5V, each phase current is about 41000±200A) to melt, and the scrap steel is completely melted after 42 minutes of smelting;

[0133] 4) All the returned material is melted, the slag is melted, and the temperature of the molten metal is raised to 1593°C;

[0134] Step 3: Restore batch by batch

[0135] 1) The power transmission gear is adjusted from 5 gears to 8 gears (voltage 170±5V, current of each phase is about 39000±200A), start to add stainless steel dust ...

Embodiment 3

[0149] This embodiment is to make mother liquor with pretreated molten iron

[0150] The first step: make the dedusting ash briquette, which is the same as the first embodiment.

[0151] Step Two: Make the Mother Liquor

[0152] 1) Pretreated molten iron is used as mother liquor, and 300 kg of lime is tiled on the bottom of the furnace; 8.1 tons of pretreated molten iron is poured into the furnace with a molten iron tank, and the P of the pretreated molten iron is 0.030%;

[0153] 2) The power transmission gear is selected to the fifth gear (voltage 190±5V, current of each phase is about 41000±200A), and the temperature of the molten iron is raised to 1590°C.

[0154] The 3rd step: reduce batch by batch, identical with embodiment one.

[0155] The 4th step: final reduction, identical with embodiment one. A total of 23 tons of stainless steel dust removal briquettes, 19.2 tons of molten metal, and a smelting cycle of 273 minutes were added. The control situation after the f...

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Abstract

The invention is a stainless steel ash removing method for smelting inconel. The method comprises the steps as follow; 1 make ash removing block, comprising the following three steps; 1) selective mixing; 2) extrusion molding; 3) natural drying; 2 make the master liquid by melting the normal recycled waste steel or stainless slag steel, pre-treated the molten iron, the ash removing block and the chromate nickel sponge iron inside the electric furnace; 3 batch-by- batch restoring, which comprises the following three steps: 1) add the block and the extra coke or coke breeze to smelt after the raw material used as master liquid is fully melted; 2) supply power with 15 to 20 minutes, then stop for conducting the operations of temperature measuring, exampling and analyzing, and add ferrosilicon breeze and lime; 3) the molten iron is remained between 1550 to 1600 DEG C in the smelting process; 4 finally restoring, and the main components of the metal solution after being finally restored are as follow: C percent is more than or equal to 2.50, Si percent is more than or equal to 0.20, P percent is less than or equal to 0.045, Cr percent is more than or equal to 5.0, and Ni percent is more than or equal to 1.5. The invention has the advantages of reducing environment pollution and increasing the metal yield of the ash removing.

Description

technical field [0001] The invention relates to a method for smelting inconel alloy with stainless steel dust removal ash. Background technique [0002] Stainless steel dust contains Cr 2 o 3 , NiO, FeO and other metal oxides, if they are discharged directly without harmless treatment, it will not only pollute the environment (especially Cr 6+ ions), and the precious metals contained therein cannot be recycled, which will also cause waste of resources and increase of production costs. The test results show that the average dust removal ash produced by smelting 1 ton of stainless steel is 36.4 kg, while the stainless steel dust removal ash contains 40-60% metal. For a stainless steel plant with an annual output of 2 million tons, the annual dust removal ash discharge is about 72,800 tons , If not recycled, about 35,000 tons of metals will be wasted. With the development of the economy, the production capacity of stainless steel is continuously expanding. At present, the h...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22B7/02C22B1/14C22C35/00
CPCY02P10/20
Inventor 张增武
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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